Hitachi RAS-NP4US Manual

Installation, Operation and Maintenance
INSTRUCTIONS MANUAL
SPLIT-SYSTEM
AIR CONDITIONERS
Models：
：：
：
Cooling Units Condensing Units
RAS-NP4US + RAS-NP4CTS
RAS-NP5US + RAS-NP5CTS
RAS-NP6US + RAS-NP6CTS
RAS-NP8US + RAS-NP8CTS
RAS-NP9US + RAS-NP9CTS
RAS-NP10US + RAS-NP10CTS
RAS-NP13US + RAS-NP13CTS
RAS-NP15US + RAS-NP15CTS
REFRIGERANT:R410A
IMPORTANT:
READ AND UNDERSTAND THIS
INSTRUCTION MANUAL BEFORE
USING THIS AIR CONDITIONER.
KEEP THIS MANUAL FOR FUTURE
REFERENCE.
65MP31
96

IMPORTANT NOTICE
˗HITACHI pursues a policy of continuing improvement in design and performance of products. The
right is therefore reserved to vary specification without notice.
˗HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
˗No part of this manual may be reproduced without written permission.
˗Signal words (DANGER, WARNING and CAUTION)are used to identify levels of hazard
seriousness. Definitions for identifying hazard levels are provided below with their respective signal
words.
Immediate hazards which WILL result in severe personal injury or
death.
Hazards or unsafe practices which COULD result in severs personal
injury or death.
Hazards or unsafe practices which COULD result in minor personal
injury or product or property damage.
Useful information for this operation and/or maintenance.
˗If you have any questions, contact your contractor or dealer of HITACHI.
˗This manual gives a common description and information for this air conditioner which you operate
as well as for other models.
˗This air conditioner has been designed for the following temperatures. Operate the air conditioner
within this range.
Condenser Air Inlet Temperature and Evaporator Air Inlet Temperature
Model
Condenser Air Inlet Temperature
-
Dry Bulb
-
Evaporator Air Inlet Temperature
-
Dry/Wet Bulb
-
Maximum
Minimum
Maxi
mum
Minimum
All Models 52°C
125°F
20°C
68°F
35°C / 21.5°C
95°F / 70.5°F
19.5°C / 14°C
67°F / 57°F
NOTES:
1. When the unit is operating at a condenser air inlet temperature of 52°C DB (125°F DB), the
maximum evaporator air inlet temperature shall be 18°C WB (64.4°F WB).
2. All models: 80% to 120% of Nominal Air Flow.
Hitachi’s air conditioners are designed and manufactured based on using the specified refrigerants. The applicable
refrigerants are specified to each unit models. However, in the global sites, it is revealed that charging different type
of refrigerants instead of the specified refrigerants. This action may cause mechanical troubles, malfunction and
failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Therefore, Do Not charge the non-specified refrigerants or others in the refrigerant cycle of the unit as follows:
˗Hydrocarbon Refrigerants such as Propane or etc.
˗Oxygen, Flammable Gases such as Acetylene or etc.
˗Poisonous Gases.
The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs,
Service Manuals and the specification label in the each unit. Be aware that Hitachi does not take any
responsibility for unit failure, troubles of malfunction, and any accidents caused by charging the
non-specified refrigerants or others such as above.
DANGER
炰
烉
ˏDANGER
炰
ˏ
WARNING
炰
烉
ˏCAUTION
炰
烉
NOTE
烉

OPERATION INSTRUCTIONS HITACHI Split-System Air Conditioners
For Combined Models: RAS-NP4US+RAS-NP4CTS
RAS-NP5US+RAS-NP5CTS
RAS-NP6US+RAS-NP6CTS
RAS-NP8US+RAS-NP8CTS
RAS-NP9US+RAS-NP9CTS
RAS-NP10US+RAS-NP10CTS
RAS-NP13US+RAS-NP13CTS
RAS-NP15US+RAS-NP15CTS
Starting Procedures
1. Switch ON the main power source to the
unit.
2. Set the operation switch of the room
thermostat to the desired operation position.
FAN-Ventilation Operation
COOL-Cooling Operation
3. Set the thermostat knob of the room
thermostat to the desired temperature.
4. Set the system switch of the room thermostat
to the ON position.
Stopping Procedures
1. Set the operation switch to the OFF position.
2. Switch OFF the main power source to the
unit. Please contact your service shop if the
trouble is still not solved.
Maintenance
1. Clean or replace the filter.
2. Clean the cabinet with cleaner.
3. Clean the condensate drain pan and the drain
piping.
4. Clean the condenser. It is recommended that a
specialist be contacted for this type of work.
5. Check for abnormal sounds and vibration.
Stop the unit and contact your service shop, if
observed.
Troubleshooting
Unit Does Not Start
1. Is the main power source switch to the unit
ON?
2. Is the main fuse normal?
3. Is the phase of main power source right?
Poor Cooling Operation
1. Are there any obstacles, which hamper
sufficient air to the condenser?
2. Check to ensure that the thermostat is set at
the desired position
3. Check the air filter for clogging.
4. Are there any obstacles, which hamper free
air flow to the room thermostat?

IMPORTANT NOTICE
˗HITACHI pursues a policy of continuing improvement in design and performance of products. The
right is therefore reserved to vary specification without notice.
˗HITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
˗No part of this manual may be reproduced without written permission.
˗Signal words (DANGER, WARNING and CAUTION)are used to identify levels of hazard
seriousness. Definitions for identifying hazard levels are provided below with their respective signal
words.
Immediate hazards which WILL result in severe personal injury or
death.
Hazards or unsafe practices which COULD result in severs personal
injury or death.
Hazards or unsafe practices which COULD result in minor personal
injury or product or property damage.
Useful information for this operation and/or maintenance.
˗If you have any questions, contact your contractor or dealer of HITACHI.
˗This manual gives a common description and information for this air conditioner which you operate
as well as for other models.
˗This air conditioner has been designed for the following temperatures. Operate the air conditioner
within this range.
Condenser Air Inlet Temperature and Evaporator Air Inlet Temperature
Model
Condenser Air Inlet Temperature
-
Dry Bulb
-
Evaporator Air Inlet Temperature
-
Dry/Wet Bulb
-
Maximum
Minimum
Maxi
mum
Minimum
All Models 52°C
125°F
20°C
68°F
35°C / 21.5°C
95°F / 70.5°F
19.5°C / 14°C
67°F / 57°F
NOTES:
1. When the unit is operating at a condenser air inlet temperature of 52°C DB (125°F DB), the
maximum evaporator air inlet temperature shall be 18°C WB (64.4°F WB).
2. RUA-NP4ATS,RUA-NP5ATS,RUA-NP9ATS and RUA-NP10ATS: 80% to 120% of Nominal
Air Flow.RUA-NP6ATS and RUA-NP8ATS: 80% to 115% of Nominal Air Flow.
Hitachi’s air conditioners are designed and manufactured based on using the specified refrigerants. The applicable
refrigerants are specified to each unit models. However, in the global sites, it is revealed that charging different type
of refrigerants instead of the specified refrigerants. This action may cause mechanical troubles, malfunction and
failure, and in the worst case, it endangers safety seriously and may cause a fire or an explosion.
Therefore, Do Not charge the non-specified refrigerants or others in the refrigerant cycle of the unit as follows:
˗Hydrocarbon Refrigerants such as Propane or etc.
˗Oxygen, Flammable Gases such as Acetylene or etc.
˗Poisonous Gases.
The types of charging refrigerants are indicated in the Installation and Maintenance Manuals, Technical Catalogs,
Service Manuals and the specification label in the each unit. Be aware that Hitachi does not take any
responsibility for unit failure, troubles of malfunction, and any accidents caused by charging the
non-specified refrigerants or others such as above.
DANGER
炰
烉
ˏDANGER
炰
ˏ
WARNING
炰
烉
ˏCAUTION
炰
烉
NOTE
烉

HITACHI Split-System Air Conditioners Cooling Units
Models: RAS-NP4US through RAS-NP15US
RAS-NP4US and RAS-NP5US
1. Return Air Connection
2. Supply Air Connection
3. Refrigerant Piping Connection
for Liquid Line
4. Refrigerant Piping Connection
for Gas Line
5. Hole for Power Supply
6. Condensate Drain Connection
RAS-NP9US and RAS-NP10US
RAS-NP6US and RAS-NP8US RAS-NP13US and RAS-NP15US

RAS-13NPCTS and RAS-NP15CTS
RAS-NP4CTS and RAS-NP5CTS
HITACHI Split-System Air Conditioners Condensing Units
Models: RAS-NP4CTS through RAS-NP15CTS
RAS-NP6CTS and RAS-NP8CTS
1. Condenser Air Intake
2. Condenser Air Discharge
3. Refrigerant Piping Connection
for Liquid Line
4. Refrigerant Piping Connection
for Gas Line
5. Hole for Power Supply
6. Hole for Control Circuit
7. Service Panel
RAS-NP9CTS and RAS-NP10CTS

1
PREPARATION
Preparation
Initial Check
Required Materials - Measure, Architectural Information, Regarding Installation Location.
Installation Location - Confirm that the final installation location is available for convenient piping,
wiring and ducting work. Strong water runoff should be avoided.
Installation Space - Check for obstacles which restrict air flow or hamper maintenance work in the
space specified in Fig. 1.
Foundation - Make sure the foundation is smooth, horizontal and sufficiently strong, taking into
account the maximum foundation gradient Fig. 2. and the unit weight balance Fig. 3-1 and Fig. 3-2.
Cooling Unit
Confirm elevation provision for the unit on a solid base with an iron frame or concrete curbs in order to
obtain proper clearance beneath the unit or confirm suspension provision for the unit shown in Fig.
4-1.
Condensing Unit
Confirm elevation provision for the unit on a solid base with an iron frame or concrete curbs shown in
Fig. 4-2. in order to obtain proper clearance beneath the unit for either rooftop or on-the-ground
installation. Additionally, for on-the-ground installation, provide a gravel or concrete space around the
condenser air intake, in order to avoid air flow obstruction due to grass or other vegetation.
Unit - Check to ensure that the unit has been transported without damage. File a damage claim with
the transportation companies if mishandling due to transportation company negligence is suspected.
Transportation - secure the route to the final installation location by confirming the packing
dimensions (see “Unit General Data” in Technical CatalogⅠ).

2
Refrigerant Piping
Connection Side
700mm
700mm
INSTALLATION SPACE
Installation Space
Cooling Units Condensing Units
RAS-NP4US through RAS-NP8US RAS-NP4CTS through RAS-NP10CTS
RAS-NP9US through RAS-NP15US RAS-NP13CTS and RAS-NP15CTS
Fig. 1.
Installation Space

3
MAXIMUM FOUNDATION GRADIENT
Maximum Foundation Gradient
Cooling Units
Condensing Units
Fig.2 Maximum Foundation Gradient
Model Dimensions A B
deg. mm deg. mm
RAS-NP4US 0.6 10 0.6 10
RAS-NP5US 0.6 10 0.6 10
RAS-NP6US 0.6 10 0.6 12
RAS-NP8US 0.6 10 0.6 15
RAS-NP9US 0.6 10 0.6 16
RAS-NP10US 0.6 10 0.6 16
RAS-NP13US 0.6 15 0.6 16
RAS-NP15US 0.6 15 0.6 16
Model Dimensions A B
deg. mm deg. mm
RAS-NP4CTS 1.0 14 1.0 17
RAS-NP5CTS 1.0 14 1.0 17
RAS-NP6CTS 1.0 19 1.0 23
RAS-NP8CTS 1.0 19 1.0 23
RAS-NP9CTS 1.0 22 1.0 23
RAS-NP10CTS 1.0 22 1.0 23
Model Dimensions A B
deg. mm deg. mm
RAS-NP13CTS 1.0 38 1.0 21
RAS-NP15CTS 1.0 38 1.0 21

4
WEIGHT BALANCE
Weight Balance
Cooling Units
Model Dimensions (mm) Approximate
Operating
Weight (kg)
A B C D
RAS-NP4US 510 610 970 1,130 90
RAS-NP5US 510 610 970 1,130 95
RAS-NP6US 600 610 1,150 1,130 120
RAS-NP8US 750 610 1,430 1,130 130
RAS-NP9US 800 610 1,530 1,130 145
RAS-NP10US 800 610 1,530 1,130 150
RAS-NP13US 820 830 1,560 1,530 200
RAS-NP15US 820 830 1,560 1,530 210
◎
◎◎
◎：
：：
：Center of Gravity
Fig.3-1 Weight Balance

5
WEIGHT BALANCE
Weight Balance
Condensing Units
Model Dimensions (mm) Approximate
Operating
Weight (kg)
A B C D
RAS-NP4CTS 410 390 850 950 145
RAS-NP5CTS 410 390 850 950 150
RAS-NP6CTS 550 530 1,130 1,300 190
RAS-NP8CTS 550 530 1,130 1,300 200
Model Dimensions (mm) Approximate
Operating
Weight (kg)
A B
RAS-NP9CTS 700 550 265
RAS-NP10CTS 700 550 265
Model Dimensions (mm)
Approximate
Operating
Weight (kg)
A B
RAS-NP13CTS 1,100 480 370
RAS-NP15CTS 1,100 480 390
◎
◎◎
◎：
：：
：Center of Gravity
Fig.3-2 Weight Balance

6
FOUNDATION PROVISION
Foundation Provision
Cooling Units
RAS-NP4US through RAS-NP8US
RAS-NP9US through RAS-NP15US
Fig.4-1. Foundation Provision
Condensing Units
Fig.4-2. Foundation Provision
Model Dimensions (mm)
A
RAS-NP4US 1,018
RAS-NP5US 1,018
RAS-NP6US 1,198
RAS-NP8US 1,478
Model Dimensions (mm)
A B
RAS-NP9US 1,468 988
RAS-NP10US 1,468 988
RAS-NP13US 1,507 1,395
RAS-NP15US 1,507 1,395
Model Dimensions (mm)
A B
RAS-NP4CTS 790 965
RAS-NP5CTS 790 965
RAS-NP6CTS 1,070 1,315
RAS-NP8CTS 1,070 1,315
RAS-NP9CTS 1,240 1,345
RAS-NP10CTS 1,240 1,345
RAS-NP13CTS 1,195 2,180
RAS-NP15CTS 1,195 2,180

7
PLACING THE UNIT
Placing the Unit
Tools and Instruments- Pincers, Wrenches, Facilities to transport and place the unit.
Transportation- Transport the unit as close to the final installation location as practical before unpacking
is performed. Keep the unit upright. When transporting the unit after unpacking has been performed, take
note of the following.
Rolling - Place three equal-sized rollers under the base frames. Each roller must carry both of the outer
frames, and must be situated to balance the unit (refer to the weight balance Fig. 3-1 and Fig.3-2.).
Lifting by Forklift - Insert the forks under the base frames and lift the unit, exercising care to catch both
of the outer frames.
Rigging - Apply spreader bars to the top of the unit, in order to prevent damage to the unit due to cable
scratches.
Fig. 5. Lifting and Rigging
Unpacking - Follow the instructions marked on the packing.
NOTE:
Keep the unit covered with a vinyl cover during installation work for peripheral equipment.

8
ELECTRICAL WIRING
Electrical Wiring
Tools and Instruments- One Set of Wiring Tools, Electrical Tester (Clamp Meter).
Schedule Check - Confirm that the field-selected electrical components (main power switch, fuses,
wires, conduit connections, wire terminals) are properly selected according to “Electrical Data” in
Technical catalogⅠand ensure that they comply with national and local codes. It is recommended that
the main power switch be locked on the “OFF” position, to prevent against accidental supply of power
during unit servicing.
Main Power Wiring Procedures - Confirm that electrical power is not being supplied to the installation
location prior to any electrical installation work.
1. Install the field-supplied main switch box in the properly selected location.
2. Install conduit connectors in the hole for power wiring.(knockout holes).
3. Lead main power wires and the earth wire through the connector to the screw terminals for main
power and earth wire in the unit. The neutral wire for 380V and 415V power supplies should also be
led through the connector.
Condensing Unit
Firmly connect the wires with wire terminals to the unit screw terminals R(L1),S(L2) and T(L3) and also
Mp(N) for 380V and 415V power supplies according to Fig. 6 or the wiring label attached to the magnetic
switch box. A scroll compressor is equipped. Because that the rotation direction of the orbiting scroll of
the HITACHI scroll type compressor is fixed, therefore a reverse & single phase sequence protection
relay is equipped in this unit. If each phase R, S or T of the power source is incorrectly connected, the
compressor does not start due to the activation of the reverse & single phase sequence protection relay.
Therefore, in order to check the correct wiring connection, the utilization of a phase sequence indicator is
recommended when the unit is started after installation of the unit.
(1) If the phase is wrong, exchange two of the three wires connected from the main power source to the
main terminals of the unit as indicated with dotted lines, and then check the rotation direction of the
phase sequence indicator once again. Do not exchange the wires in the unit in order to protect the
compressor against the reversal rotation.
(2) Do not operate the compressor by depressing the button of the magnetic switch for the compressor.
Cooling Unit
The power supply wires are to be led from the outlet terminals in the condensing unit for the evaporator
fan motor and can be directly reached to the motor terminals. A three-phase fan motor is equipped in the
cooling unit, therefore the fan motor rotation should be checked.
Control Wiring - Install the optional room thermostat at a suitable location in the space to be
air-conditioned. Connect the control wires between the unit terminals and the thermostat terminals
according to Fig. 6 or the wiring label. If a locally-supplied thermostat and switch are installed, connect
the wiring according Technical Catalog Ⅰ.
NOTE:
The setting and the capacity of the overcurrent relay and the magnetic contactor equipped in the
condensing unit are only applicable for the cooling unit of the HITACHI Standard Split System. When
other cooling unit is to be connected, it might be necessary to change them in accordance with the
electrical characteristics of the cooling unit.

9
TS N2 Mp
(Condensing Unit)
Electrical Box
3 4 5 6
Motor Terminal
1 2 3 4 56
L3
TS
L2L1
R
Control Circuit
Terminal
PCB Terminal
1
B DA E F
Control Circuit
(Field-Supplied)
Main Power Switch
RAS-NP10US
4 5
RAS-NP9CTS and RAS-NP10CTS
(Field-Supplied)
Main Power Switch
Valve NO.2
Solenoid
Valve NO.1
Solenoid
(Field-Supplied)
(Field-Supplied)
(Field-Supplied)
Main Power Switch
(Cooling Unit)
(Field-Supplied)
Thermostat
※Room
RAS-NP9US and
Electrical Box
Main Power Terminal
L2 L3L1
R23
(Cooling Unit)
(Field-Supplied)
Thermostat
※Room
RAS-NP4US through
Electrical Box
Main Power Terminal
L2 L3L1
R TS N2 Mp
(Condensing Unit)
Electrical Box
345 6
Motor Terminal
1 2 3456
L3
TS
L2L1
R
Control Circuit
Terminal
PCB Terminal
1B DA E F
Control Circuit
(Field-Supplied)
Main Power Switch
(Field-Supplied)
Solenoid Valve
RAS-NP8US
23
RAS-NP4CTS through RAS-NP8CTS
ELECTRICAL WIRING
Field Wiring Connection
Fig. 6-1. Field Wiring Connection
.

10
L2 L3L1
R TS N Mp
(Condensing Unit)
Electrical Box
Motor Terminal
PCB
B DA E F
(Field-Supplied)
Main Power Switch
Valve NO.2
Solenoid
45
RAS-NP13CTS and RAS-NP15CTS
Valve NO.1
Solenoid
2 3
(Field-Supplied)
(Field-Supplied)
(Cooling Unit)
(Field-Supplied)
※Room Thermostat
RAS-NP13US and RAS-NP15US
Electrical Box
Main Power Terminal
S TR
S TR
ELECTRICAL WIRING
Fig. 6-2. Field Wiring Connection
NOTE:
The control circuit is wired for the 240V control circuit (unit power source, 415V) at the factory. Therefore
for the 220V control circuit change the wiring at the terminal base in the electrical control box, according
to the next page “Different Main Power Supply”

11
ML
SR T
N
1
PCB
PCB
ML
SR T
N
1
ELECTRICAL WIRING
Printed Circuit Board (PCB) Layout
All DSW were set correctly at factory, do not change settings of DSW. The following figures are only for
reference in installation.After installation, make sure all DSW were set as factory setting.
PCB Drawing
The PCB in the Unit is operating with 4 types of DIP switches. The location is as follows:
Mark Name of Parts Mark Name of Parts
CT1-R,S,T Current Transformer for NO.1 Compressor DSW1 Dip Switch for Capacity Setting
CT2-R,S,T Current Transformer for NO.2 Compressor DSW2 Dip Switch for Optional Function Setting (1)
CT3-R,S,T Current Transformer for NO.3 Compressor DSW3 Dip Switch for Optional Function Setting (2)
CT4-R,S,T Current Transformer for NO.4 Compressor DSW4 Dip Switch for Optional Function Setting (3)
CN6 Connector for Transformer Input L,M Terminal for Different Main Power Supply
CN7 Connector for Transformer Output A,B,D,E,F Terminal for Room Thermostat
SW1 Switch for Alarm History Checking SEG1 Indicator for Information
Different Main Power Supply
When the main power supply is 380V (nominal voltage), be sure to change the wiring connected terminal
from L to M as shown figure below.
For 415V For 380V

12
21 34
21 34
21 34 21 34
21 3
ELECTRICAL WIRING
Factory Setting of Dip Switch (DSW)
DSW1: Capacity Setting
Capacity 4HP 5HP 6HP 8HP 9HP 10HP 13HP 15HP
Setting
Position
DSW2: DSW3: DSW4:
Optional Function Setting(1) Optional Function Setting(2) Optional Function Setting(3)
Function 4~15HP Function 4~15HP Function 4~15HP
Setting
Position
Setting
Position
Setting
Position
Optional Function Setting of Dip Switch (DSW2)
Before setting DSW, firstly turn off power source and set the position of the DSW. If the switches are set
without turning off the power source, the contents of the setting are invalid. Mark of “■” indicates the
position of dip switch.
DSW2: Optional Function Setting (1)
Number of Compressor Dip Switch Setting
Force No.1 Compressor Stop
Force No.2 Compressor Stop
Alarm History Check
(1) First to push SW1 continually for more than 3 seconds.
(2) The indicator will flicker “AL” if the PCB already be in “Alarm History Check” mode.
(3) In “Alarm History Check” mode, each time to push SW1 can be showed alarm code by indicator,
total are 5 alarm codes for cyclical.
(4) To push SW1 continually for more than 5 seconds to clean all alarm record.

13
ELECTRICAL WIRING
Alarm Detect Function
(1) Each alarm code is composed of 2 digits for 1 set, or 4 digits for 2 sets.
(2) If the alarm code is composed of 1 set(2 digits)：
(3) If the alarm code is composed of 2 sets(4 digits)：
(4) If the system is operated under abnormal conditions, the alarm code will be showed as digits by the
indicator.
Alarm Code Description Check Item
—
03 Detect of CPU Error. The CPU of PCB Self-Checking.
(no need to check the item of unit)
—
05
Reverse or Phase Lack of Main Power
Source. Check the connection of main power supply. (Refer to Main Power Wiring Procedures)
C1
08
Overheat forCompressor1.
(Internal thermostat for compressor1 acted) Check the Internal Thermostat of Compressor1.
C2
Overheat for Compressor2.
(Internal thermostat for compressor2 acted) Check the Internal Thermostat of Compressor2.
—
19 Overcurrent for Indoor Fan Motor. Check the Current for Indoor Fan Motor.
—
31 No Capacity Setting of Unit. Check the Setting of DSW1 Switch.
(Refer to Factory Setting of DIP Switch)
C1
39
Overcurrent for Compressor Motor1. Check the Current for Compressor Motor1.
(Refer to Troubleshooting)
C2 Overcurrent for Compressor Motor2. Check the Current for Compressor Motor2.
(Refer to Troubleshooting)

14
ELECTRICAL WIRING
(Continued)
Alarm Code Description Check Item
C1
40
CT for Compressor1 Disconnected. Check the Connection for CT1.
C2 CT for Compressor2 Disconnected. Check the Connection for CT2.
C1
45
High Pressure Switch PS(H)1 Acted. Check the Discharge Pressure for
Compressor1.(Refer to Troubleshooting)
C2 High Pressure Switch PS(H)2 Acted. Check the Discharge Pressure for
Compressor2.(Refer to Troubleshooting)
C1
47
Low Pressure Switch PS(L)1 Acted. Check the Suction Pressure for
Compressor1.(Refer to Troubleshooting)
C2 Low Pressure Switch PS(L)2 Acted. Check the Suction Pressure for
Compressor2.(Refer to Troubleshooting)
F1
57
Overheat for Outdoor Fan Motor1.
(Internal thermostat for outdoor fan motor1
acted)
Check the Internal Thermostat of Outdoor Fan
Motor1.
F2
Overheat for Outdoor Fan Motor2.
(Internal thermostat for outdoor fan motor2
acted)
Check the Internal Thermostat of Outdoor Fan
Motor2.
—
93
Power Supply Interrupted Less Than 2
seconds. Check the Main Power Supply.
—
94
Power Supply Interrupted More Than 2
seconds. Check the Main Power Supply.
—
dd
Wrong Wiring Connection for Room
Thermostat. Check the Connection for PCB Terminals A, D, E, and F.
NOTE:
1) If unit is still under abnormal conditions, please contact your distributor.
.